Copying telegraph



Sept. 18 1923. 1,468,542

M. H. PETERSEN COPYING TELEGRAPH Filed June 8, 1921 3 Sheets-Sheet 1 Sept. 18 1923. 1,468,542

M. H. PETERSEN COPYING TELEGRAPH Filed June 8. 1921 3 Shoots-Sheet 2 Sept. 18, 1923. 1,468,542

M. H. PETERSEN COPYING TELEGRAPH Filed June 8, 1921 .3 Sheets-Sheet 5 Patented Sept. 18, 1923.

UNITED STATES HAGNE HEBMOD PETERSEN, OF CHRISTIANIA,

COPYING TELEGRAPH.

Application filed June e,

To all whom it may concern:

Be it known that I, MAGNE HERMOD PE- TERSEN, :1 subject of the King of Norway, re siding at Sorgenfrigate .36, Christiania, Norway, have invented certain new and useful Improvements in Copying Telegraphs; and I. do hereby declare the following to be a, full, clear, and exact description of the invention, such as will enable others-skilled. in the art to which it appeiteins to make and use the some, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

The present invention has for its object a rocess and apparatus for reproducing writing or pictures by means of electric elementary impuises.

The inventionprincipally consists in the use of on oscillogreph at the receiving Ste tion actuetei by nleens of electric elemen 'tery impulses in Combination with one or more optical arrangements for producing overiapping points on a light-sensitive ma teriai corresponding to elementary signs which form together a, reproduction of the Writing or picture to be reproduced.

Two or more of optical arrangements may be used which are so disposed that the light re s which are reflected from a mirror actuate by or mounted on an oscillograph overlap each other with regard to the nerrow slot, whereby there is caused the fee metion oi as number of points or elementary signs on the fight-sensitive materiel.

Two forms of the invention are illustreted on the drewing.

Figs. 1 and F23 represent front view and plan partiy in section of the apparatus eceorciing to one form of the invention.

Fig. 3 is diagram showin a particular errel'igenient for increasing t e number of clemente-rv signs.

Fig. 4- is a (iiegremrnnticel illustration of three iiifierent arrangements of the over lap ping oseiiletions.

*ig. 5 is e, ifront View of e modified con strnctien.

Fig. is a, sectional plan of the some on the line 1 1 Fig. 5 and Fig. 7 e, sectional nlen on the line H II Fig. 5. v

The main feature of the invention con sists therein that the elementary impulses 1921. Serial LFo. $76,002.

caused by means of the transmitted writ ing or picture are conducted into the loop of en osciilogreph, whereby a mirror actuated by the some is caused to perform corre sponding oscillations thereby reflecting a my of light so as to throw points of iiglit on a light-sensitive material so'thet elemen.

tery signs are formed thereon, which form together a reproduction of the original writing or picture.

The apparatus comprises the following parts (Figs. 1 and 2) A stationary source of light A throwing intense light, two siots F on the ioop mirror of the osciiiograph, which egein' refleets the rays of light on to the Eight-smash tWe paper measuring icon with n loop mirror mounted thereon is pieced in the field of electromegnet J. The measuring loop itself is coupled in. the circuit of the driving current necessary for taking up the picture enci. by alteration or this current is ceased to oseiiiete corresponding to the current tim pulses in the circuit. 7

A mirror arrangement C two rays of light on the loop mirror from each side of the some.

An optical arrangement D eoiieets the rays oi light from the source of light enri concentrates them before they reech the ioop mirror.

An eptieai arrangement concen the ray of iight refiecte from the ice mirror on the light-sensitive paper.

The necessary bienders reguiete the my of light and the exposition of the caper.

The apparatus 5 serves to mount anti. guide the lightsensitive peper.

The operation of the device is as follows:

A light-sensitive meteriei (pepenfiirn or the like) is pieced on the device or drum G to which is imparted by means of e suitehie driving mechanism a rotary and progressive movement. The whoie of the apparatus is placed. in fight-tight H of which the sideturned against the loop mirror is pro-- vieieri with a narrow verticsi siet Uwing to the osciiietions of the current conducted to the measuring loop, correspomiing csciiletions ere imperterltc the mirror which is thereby eeuseti to reflect two or more rays of light (in. the present c two} in the dire ticn of the iight-ser paper, said rays oi light oscillating horizontally across the narrow Vertical slot K in front of the paper.

The original which is to be reproduced is directly or indirectly connected in the same circuit as the measuring loop and causes the electrical oscillation in the circuit by means of particular interrupting and closing arrangement.

As the ray of light, concentrated by means of lens arrangement E, passes slot K the light-sensitive paper is momentarily exposed, whereby a point is produced corresponding to an elementary sign of the picture or writing. The opening or slot K or the form of lens E determines the size and form of the elementary sign.

The reproduction of pictures or writing thus takes place by production in the receiving apparatus of the necessary number of elementary signs corresponding to the original.

in order to obtain the largest possible number of elementary sign the illustrated form of the oscillograph receiver is provided with a double mirror and lens arrangement. The oscillation angle 89 and 10-11 (Fig. 3) on the loop mirror is so adjusted that the top of the curve for both light rays passes the slot in front of the paper through the collecting lens placed at the point, whereby one, two or more elementary signs are produced on the paper for each alteration or half period. The oscillating movement of the light rays reflected "from the mirrors C thus overlap each other with regard to the slot.

@n Fig. l it is seen that it is possible by difierent modes of overlapping to obtain one point for each half period (as), two points for half period (y) or four points for half period (2) etc.

In all three cases 12 and 13 illustrate the crests of the alternating curves or. elementary impulses described by the two pencils of light rays moving with respect to the slot K and through which the rays are admitted to the moving actinic surface. First one pencil of light is reflected from one mirror or one source of light by the oscillograph 6 either partly or wholly across the slot K and then the other pencil of light is similarly reflected.

Tee paths described by the pencils of light are approximately sin-curves, and as indicated at a the crests do not extend entirely across the illuminating slot K but they everlap within the opening by a small amount 0. As shown at y the overlap of the crests is greater than the width of the slot K. so that instead oi mailing only a single actinic impression as in at through the slot K, each crest makes two impressions on the moving actiuic surface.

a each wave has a saddle back crest dicated at a. n, whereby they will whose amplitude is sufficient to traverse the slot K and leave four impressions on the actinic surface for each half period, the overlap 0 being greater than the width of slot K.

According to the form of the apparatus illustrated on Figs. -7 an incandescent lamp Z) is mounted in a lamp-housing, a, said lamp being provided with two filaments c, c. The lamp-housing also serves as holder for a double lens-arrangement with (l. (2' so placed that a picture of the source of light is formed on the small oscillograph mirror 6 placed in the magnetic field of magnets f, f. g and g are the two rays of light, which are thrown on the oscillograph mirror c from the two filaments c, o to different sides thereof at a suitable angle. \Yhen the mirror is in its position of rest the light ray from g is reflected in the direction g and the light ray from g in the direction g.

When the loop to which the mirror 6 is fastened is supplied with alternating current it begins to oscillate and by a suitable supply of current to the loop the oscillation may be so adjusted that the two rays of light from opposite sides pass the centerline of the apparatus. In the centerline is placed the optical projection apparatus which is characteristic for the present invention. For constructive reasons the lamphousing is placed on one plane (I-I) and the projection arrangements in another plane (IL-II). The projection arrangement comprises the collecting lens i in the focus of which the oscillograph mirror 0 is placed. The rays sent from mirror 6 into lens 2' will therefore be parallelized by the lens. At a certain distance from the lens 1' suitable for the construction of the apparatus is placed another collecting lens Z in such a manner that the focus of the same falls on the light-sensitive paper h, which on the drawing is shown as mounted on a cylinder.

The operation of this construction is as follows:

When the oscillograph is actuated by means of signal current from the sending apparatus, the mirror 6 is oscillated and the rays of light reflected from the mirror will oscillate as indicated on Fig. 7, where m and m show the amplitudes when the mirror performs full oscillations. men the mirror is not actuated by signal current, it will either be completely at rest when the light rays are reflected outside the lens, or if a weak current always passes through the line the light rays will oscillate as inalso be outside the lens As it appears from the drawing both amplitudes of the signal current are utilized in this manner, and the light rays are utilized during the whole of their Ill passage across lens 1''. It is of no consequence whether the rays strike the edge or the center of lens 2', as they are nevertheless collected in the focus of lens Z on the lightsensitive paper. By this arrangement is thus obtained a far more intense exposition of the light-sensitive paper than in the case where the ray of light is just let in through a slot as according to the form of the invention first specified. The source of light by this last arrangement accordingly needs not be so strong as according to the first form of the invention.

It is obvious that two lamps may be used instead of a lamp with two filaments or a single lamp with a single filament may be used, whereby the rays are divided by means of mirrors.

Further the distance between the lens 11 and Z may be varied at will as. the rays of light are parallel and accordingly the light rays .may also be deflected by means of mirrors, if so desired.

Claims: I

1. In a copying telegraph, an oscillograph including a mirror, means to supply a ray of light thereto, an actinic surface arranged to receive light reflected by said mirror and means to direct a light beam from said mirror and means to permit a plurality of exposures of saidsurface for each period of the alternating current supplied to said oscillogranh.

different directions, an actinic surface, an

exposure slot arranged between said surface and mirror, the angles of incidence of said beams being arranged to reflect from the mirror in overlap in crests onto said surface through sai s 0t.

.4. In a copying telegraph, an oscillograph, an actinic surface, a collecting and a condensing lens combination .focussed on said surface, said combination arranged to direct crest portions of a light beam reflected from said mirror through said combination, the crest portions of one half period overlapping those of the. other half period of swing of the mirror.

In testimony that I claim'the foregoing as my invention, I have signed my name in presence of two subscribin witnesses.

MAGNE HERMOD IETERSEN.

Witnesses:

MORGUN Boson, GUNDSE FENSAFI LARSON. 

